Standard PEEP groups are open to all families within an area, ie they provide universal access. Some groups are for one age level. Siblings may attend, and join in activities with a group assistant when their parent/carer is more involved with the focus child.

Groups can also be multi-age level. As the programme deals with a common set of developmental themes it is possible to cover the same theme at different age levels at the same time. The ORIM learning framework and core activities are the same for every age group.